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How Big is the Gap Between Contrails and Engines?

Contrails are the white lines that sometimes form behind high flying aircraft. They are actually a type of cloud. The cloud forms because jet exhaust contains quite a bit of water. If the humidity is high, then the contrails can persist for a long time, as clouds do....
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Where did all the planes go?

It’s a lovely Friday morning here in Los Angeles. Clear blue skies, not a cloud to be seen, and no contrails either. For that matter, there don’t appear to be any planes at all. I look up into the clear deep blue sky, and I can’t see a...
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Fake, Hoax, Chemtrail Videos

Most of the supposed “chemtrail” videos out there are simply videos of persistent contrails that the video maker somehow has decided are part of a giant world-wide conspiracy involving spraying something for some purpose. But some videos are actually deliberate hoaxes, either by pranksters poking fun at the...
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Contrails and Chemtrails: The IFAQ

Most of the traffic to this site comes via Google and other search engines. It’s interesting to look at what people typed in to that ended up here. Quite often it’s just a few words like “chemtrail aircraft pictures” or “contrails engine”, but sometimes it’s a question. I...
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Aerodynamic and Rainbow Contrails

You occasionally see very pretty photos of contrails, like this one: Very pretty.  But what is it?  It’s clearly not a regular exhaust contrail, as the trail seems to start actually ON the wing, and it has a weird rainbow effect you don’t often find in exhaust contrails....
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Germans Admit They Used Düppel!

Another bit of “Chemtrail” mythology was born with this YouTube video: http://www.youtube.com/watch?v=FiUMfsR28SM This video has been seized upon by the Chemtrail community as evidence that “chemtrails” are real, and that the German government has admitted they are spraying “chemtrails”. Unfortunately the entire video is a very bad translation...
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How Long do Contrails Last?

Q) How long do contrails last? A) According to all the books on clouds in the last 70 years, contrails last anywhere from less than a second, up to several hours. If depends on the atmospheric conditions at the altitude the plane is flying. It’s unrelated to the...
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Measuring the height of contrails

How high are those contrails? That’s a very important issue if you are investigating the science of contrail formation. I’ve been thinking for a while that a good method might be to take photos at a plane at a known focal length on a digital camera, and then...
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Contrail photos through history

I’ve collected together a few photos of persistent spreading contrails from the past from 1991 back to 1940, just to show that this is nothing new, and that skies exactly like those shown on the “chemtrails” conspiracy web sites have been happening for the past 60 years. Mostly...
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